What do you mean, eyeing? The origin of idioms and the explanation of detailed words

The phonetic notation form is ㄨˇㄕˋㄉㄢㄢㄢㄢ Chinese Pinyin hǔshědān dān Zhouyi Source? H: I'm eyeing it, and I'm going to chase it one by one. Interpretation: staring eyes. Staring like a tiger. Describe an evil intention and wait for an opportunity to grab it. For example, look at these people here. Because the old lady loves Baoyu and Xifeng so much, they still say a few words behind my back, let alone me. (Qing? Cao Xueqin's Fortieth Dream of Red Mansions)